I tried editing the entity.lua myself, but since I'm an uninformed noob, I keep running into argument errors. Hopefully Simwir can return and grace us with an update in the near future. I love this mod, and the game feels incomplete without it.

Yeah, the update would be very nice...I'll second that, for it is a very useful mod.

Apparently, this works just fine in 0.15, after 3 changes:

In the mod's info.json:
Change "factorio_version": "0.14" to read "0.15" instead.

In prototypes/entity.lua:
Change line 55 from 'energy_source =' to 'burner =';
Change line 57 from 'type = "burner"' to 'fuel_category = "chemical"'.

Done! Works without erroring in-game, so no scripting updates were needed; just an entity definition update and a version change.
Not sure how it reacts to disabled train stops, though. E: No crash with disabled stops, either; just complains it can't find a path.

Would still be nice for the original author to come around and update it himself, but at least you can fix it yourself in the meantime. :)

I think I'm going to release a modified version of this if I have time to do it today.

I've posted my updated mod here https://mods.factorio.com/mods/folk/folk-shuttle